A fine-blanking die point-type blank holder and its processing method

Abstract

The invention relates to a point type blank holder of a fine blanking die and a processing method of the point type blank holder. The point type blank holder of the fine blanking die comprises a point type blank holder body; the point type blank holder is characterized in that a group of salient points are evenly distributed at the upper edge of the lower surface of the point type blank holder body according to the contour of a part needing to be formed by fine blanking, and the salient points are used for holding down a blank to as to put the blank in a three-way static hydraulic stress state in the fine blanking process. Compared with a V-shaped blank holder, the point type blank holder is easier to manufacture (only holes corresponding to the points on the designed blank holder need to be drilled in an electrode material), and the manufacturing cost of the point type blank holder is lower than the cost of the V-shaped blank holder, and therefore, the processing cost of the fine blanking die can be reduced.

Description

technical field [0001] The invention relates to a point-type blank holder of a fine blanking die and a processing method thereof. Background technique [0002] Fine blanking is an advanced metal plastic forming process. Compared with ordinary blanking, the fine blanking mold structure has added a blank holder and a reverse top plate, and the gap between the convex and concave dies is extremely small (gap = 1% material thickness) , Die edge with rounded corners. During the blanking process, before the punch contacts the blank, the blank holder presses the material on the die, and when the punch is pressed into the blank, the material is pressed by the reverse top plate, so that the metal in the shearing zone is in a three-way In the state of hydrostatic stress, the material is blanked in a pure shear deformation. [0003] Since the fine blanking mold requires a very small gap between the punch and the concave die, the precision of the punched workpiece is high, and the blan...

AI Technical Summary

Problems solved by technology

Existing V-shaped blank holder such as Figure 2a , Figure 2b As shown, EDM or CNC milling is generally used for forming, which has high processing costs and serious waste of materials, which greatly increases the manufacturing cost of fine blanking dies.

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